Cuk Converter

1. Cuk Converter
SUBMITTED TO
MRS. SHIMI SL
ASSOCIATE PROFESSOR
NITTTR CHANDIGARH
Submitted by
Mr. Dhruv Upadhaya
162510
ME (R) IC I Semester
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2. CUK Converter
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3. Description
• The output voltage can be higher or lower than the input voltage
• Capacitor C1 stores and transfers energy
• in steady state average inductor voltages VL1, VL2 are zero
• VC1 is larger than Vd and Vo
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4. Switch is off
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5. Switch is off
• VL1=Vd-VC1
• VL2=-Vo
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6. Switch is on
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7. Switch is on
• VL1=Vd
• VL2=VC1-Vo
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8. Duty Ratio
VL1 ∶ VdDTs + Vd − VC1 1 − D Ts=0
VC1 =
Vd
1−D
VL2 ∶ VC1 − Vo DTs + −Vo 1 − D Ts=0
VC1 =
1
D
Vo
dV
D
D
V 


1
0
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9. Pros and cons of Cuk Converter
Advantages:
Input current and output current have small ripple.
Disadvantages:
Requirement of capacitor C1 with large ripple current capability.
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